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Interval information
Ratio 361/360
Subgroup monzo [-3 -2 -1 2
Size in cents 4.8023167¢
Names go comma,
dudon comma
Color name 19oog2, nonogu 2nd,
Nonogu comma
FJS name [math]\text{d2}^{19,19}_{5}[/math]
Special properties square superparticular,
Tenney height (log2 nd) 16.9877
Weil height (log2 max(n, d)) 16.9917
Wilson height (sopfr (nd)) 55
Harmonic entropy
(Shannon, [math]\sqrt{n\cdot d}[/math])
~2.53837 bits
Comma size small
S-expression S19
open this interval in xen-calc

361/360, the go comma or dudon comma, also described as the undevicesimal semitones comma, is a 19-limit (also subgroup) superparticular comma of about 4.8 cents. It is the difference between 19/18 and 20/19, the two undevicesimal semitones, as well as between 19/15 and 24/19, the two undevicesimal major thirds. It is also the difference between two stacked 19/18 and 10/9. By tempering it out is defined the dudon temperament, which enables the dudon chords.


The name go comma was named by Xenwolf in 2013. It is so named after go board, which has a 19×19 grid.

See also